- 175 - 



PemilJ^ ::elinidae. 

 Oeiiv.s IdlEA Hetzius, 



KillKA sp. indet. 



A small fragment of an apparently aclult valve and. an almost 

 perfect, but very j-ouno;, valve are present. She larg-er is very 

 thielc- shell ed in the iimhonal res-ion; the hyssal notch lono;, narrow, 

 shariDly indented; the ligament grooves long, diverging at a slight 

 angle from the hyssal notch, the raised intervals between the grooves 

 narrov/"er than the grooves; external sculpture feeble, consisting 

 of numerous fine concentric striations, reinforce"! a,t intervals 

 by incrementals. Because of the decidedly narrov,' byssal notch 

 this fragment has an unusual aiopearance. The other extremely 

 small valve is subquadrate in outline; anterior lateral margin 

 flexed inv/ard, bu.t without a definite byssal notch; ligament 

 grooves relatively wide, four in number, separated by much nar- 

 rower tidges. 



Occurrence.- Lower Miocene: Bowden he's, Sowden, Jamaica. 



